Need advisory to build distributed cracking system

- Hello Experts , i need advisory about distributed cracking system , i have a server with hardware
CPU : Intel® Core™ i7-3770 CPU @ 3.40GHz
GPU : HD7970 x 1
RAM : 2GB
OS : Ubuntu 14.04 LTS (32 bit)


- i want to buy a server to build distributed cracking system , i saw performance test on the hashcat webpage , and i need advisory about hardware (mainboard , CPU , RAM ...) , cooling system like PC4 (AMD R9 290X x8 ) , and with the hardware difference between 2 server , is it possible to combine ?

Thanks